Introduction
Automatic Identification System (AIS) is not just a tracking tool—it plays a crucial role in collision avoidance when used correctly. This guide explains how officers actually use AIS during navigation.
What is AIS?
AIS is a tracking system that transmits vessel information such as position, speed, and course in real time.
AIS in Real Navigation Scenario
Situation: Crossing Traffic
- Officer identifies nearby vessel via AIS
- Checks CPA (Closest Point of Approach)
- Decides course alteration
CPA & TCPA Explained Simply
- CPA: Closest distance between two ships
- TCPA: Time to reach CPA
# These help in early decision-making
AIS vs Radar (Important Difference)
- AIS shows data from ship systems
- Radar shows actual physical targets
# Best practice: use both together
Limitations of AIS
- Can be switched off
- Wrong data input
- Delay in signal
Common Mistakes
- Blind trust in AIS
- Ignoring radar cross-check
- Late maneuver decisions
FAQs
Q1: Is AIS mandatory?
Yes, for SOLAS vessels.
Q2: Can AIS prevent collisions alone?
No, it’s only a supporting tool.
Conclusion
AIS is powerful—but only when used alongside radar and proper judgment.
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